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(a) When does a body sink in a fluid? (b) Why does a balloon filled with hydrogen gas rise up against gravity?

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(a) When does a body sink in a fluid?
(b) Why does a balloon filled with hydrogen gas rise up against gravity?
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(a) When its weight is greater than the buoyant force acting on it.
(b) Buoyant force acting on the balloon is greater than its weight.
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